Annotate newly inserted target text as a link.

Fixes (Bug 44086)

Changes:
ve.ui.LinkInspector.js
- Annotate fragment for affected range.
- Fragment returned by insertContent was a zero length range, therefore
no content was being annotated.  It is questionable whether insertContent
should return the affected range or not.
- Also changes behavior of editing existing link annotations so that the cursor is after the annotation rather than covering it when the inspector is closed

Change-Id: Ic53b9844f84781cad05ac1f63964c9aaf7de68c3
Merge "Annotate newly inserted target text as a link."